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LT1111IS8#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
L T 1111
1111fd
TYPICAL APPLICATIO
U
APPLICATIO S
U
DESCRIPTIO
U
FEATURES
33 F
SUMIDA
CD54-220M
22µH
LT1111 • TA01
µ
MBRS120T3
5V
100mA
GND SW2
SW1
LIM
I
IN
V
LT1111CS8-5
SENSE
3V INPUT
10 F*
µ
+
*OPTIONAL
+
Micropower
DC/DC Converter
Adjustable and Fixed 5V, 12V
All Surface Mount 3V to 5V Step-Up Converter
Typical Load Regulation
0
LOAD CURRENT (mA)
0
1
OUTPUT VOLTAGE (V)
2
3
4
5
6
50 100 150 200
LT1111 • TA02
25 75 125 175
V
IN
= 2V 2.2 2.4 2.6 2.8 3V
■
Operates at Supply Voltages from 2V to 30V
■
Works with Surface Mount Inductors
■
72kHz Oscillator
■
Only Three External Components Required
■
Step-Up or Step-Down Mode
■
Low-Battery Detector Comparator On-Chip
■
User Adjustable Current Limit
■
Internal 1A Power Switch
■
Fixed or Adjustable Output Voltage Versions
■
Space Saving 8-Pin MiniDIP or SO-8 Package
■
3V to 5V, 5V to 12V Converters
■
9V to 5V, 12V to 5V Converters
■
Remote Controls
■
Peripherals and Add-On Cards
■
Battery Backup Supplies
■
Uninterruptible Supplies
■
Laptop and Palmtop Computers
■
Cellular Telephones
■
Portable Instruments
■
Flash Memory VPP Generators
The LT
®
1111 is a versatile micropower DC/DC converter.
The device requires only three external components to
deliver a fixed output of 5V or 12V. Supply voltage ranges
from 2V to 12V in step-up mode and to 30V in step-down
mode. The LT1111 functions equally well in step-up, step-
down, or inverting applications.
The LT1111 oscillator is set at 72kHz, optimizing the
device to work with off-the-shelf surface mount inductors.
The device can deliver 5V at 100mA from a 3V input in
step-up mode or 5V at 200mA from a 12V input in step-
down mode.
Switch current limit can be programmed with a single
resistor. An auxiliary open-collector gain block can be
configured as a low-battery detector, linear post regulator,
undervoltage lock-out circuit, or error amplifier.
For input sources of less than 2V use the LT1110.
, LTC and LT are registered trademarks of Linear Technology Corporation
2
LT1111
1111fd
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
Operating Temperature Range
LT1111C............................................... 0°C to 70°C
LT1111I......................................... –40°C to 105°C
LT1111M (OBSOLETE) ............. –55°C to 125°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
WU
U
PACKAGE
/
O
RDER I FOR ATIO
Supply Voltage (V
IN
)............................................... 36V
SW1 Pin Voltage (V
SW1
)......................................... 50V
SW2 Pin Voltage (V
SW2
)............................ –0.5V to V
IN
Feedback Pin Voltage (LT1111) ............................. 5.5V
Switch Current....................................................... 1.5A
Maximum Power Dissipation ............................ 500mW
ORDER PART
NUMBER
LT1111CN8
LT1111CN8-5
LT1111CN8-12
ORDER PART
NUMBER
LT1111CS8
LT1111CS8-5
LT1111CS8-12
LT1111IS8
T
JMAX
= 90°C, θ
JA
= 130°C/W (N)
1
2
3
4
8
7
6
5
TOP VIEW
I
LIM
V
IN
SW1
SW2
FB (SENSE)*
SET
A0
GND
N8 PACKAGE
8-LEAD PLASTIC DIP
*FIXED VERSIONS
T
JMAX
= 90°C, θ
JA
= 150°C/W
1
2
3
4
8
7
6
5
TOP VIEW
FB (SENSE)*
SET
A0
GND
I
LIM
V
IN
SW1
SW2
S8 PACKAGE
8-LEAD PLASTIC SO
*FIXED VERSION
E
LECTR
IC
AL C CHARA TERIST
ICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.V
IN
= 3V, Military or Commercial Version
S8 PART MARKING
1111
11115
11111
1111I
(Note 1)
LT1111MJ8
LT1111MJ8-5
LT1111MJ8-12
J8 PACKAGE
8-LEAD CERAMIC DIP
T
JMAX
= 150°C, θ
JA
= 120°C/W (J)
Consult LTC Marketing for parts specified with wider operating temperature ranges.
OBSOLETE PACKAGE
Consider the N8 Package for Alternate Source
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
Q
Quiescent Current Switch OFF 300 400 µA
V
IN
Input Voltage Step-Up Mode ● 2.0 12.6 V
Step-Down Mode
● 30.0 V
Comparator Trip Point Voltage LT1111 (Note 2) ● 1.20 1.25 1.30 V
V
OUT
Output Sense Voltage LT1111-5 (Note 3 ● 4.75 5.00 5.25 V
LT1111-12 (Note 3)
● 11.40 12.00 12.60 V
Comparator Hysteresis LT1111 ● 8 12.5 mV
Output Hysteresis LT1111-5 ● 32 50 mV
LT1111-12
● 75 120 mV
f
OSC
Oscillator Frequency 54 72 88 kHz
DC Duty Cycle: Step-Up Mode Full Load 43 50 59 %
Step-Down Mode 24 34 50 %
t
ON
Switch ON Time: Step-Up Mode I
LIM
Tied to V
IN
579 µs
Step-Down Mode V
OUT
, = 5V, V
IN
= 12V 3.3 5 7.8 µs
V
SAT
SW Saturation Voltage, Step-Up Mode V
IN
= 3.0V, I
SW
= 650mA 0.5 0.65 V
V
IN
= 5.0V, I
SW
= 1A 0.8 1.0 V
SW Saturation Voltage, Step-Down Mode V
IN
= 12V, I
SW
= 650mA 1.1 1.5 V
3
L T 1111
1111fd
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
FB
Feedback Pin Bias Current LT1111, V
FB
= 0V ● 70 120 nA
I
SET
Set Pin Bias Current V
SET
= V
REF
● 70 300 nA
V
OL
Gain Block Output Low I
SINK
= 300µA, V
SET
= 1.00V ● 0.15 0.4 V
Reference Line Regulation 5V ≤ V
IN
≤ 30V ● 0.02 0.075 %/V
2V ≤ V
IN
≤ 5V 0.20 0.400 %/V
A
V
Gain Block Gain R
L
= 100k (Note 4) ● 1000 6000 V/V
I
LIM
Current Limit 220Ω from I
LIM
to V
IN
400 mA
Current Limit Temperature Coefficient ● –0.3 %/°C
Switch OFF Leakage Current Measured at SW1 Pin, V
SW1
= 12V 1 10 µA
Maximum Excursion Below GND I
SW1
≤ 10µA, Switch OFF –400 –350 mV
E
LECTR
IC
AL C CHARA TERIST
ICS
LT1111C
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
Q
Quiescent Current Switch OFF ● 300 450 µA
f
OSC
Oscillator Frequency ● 54 72 95 kH
DC Duty Cycle: Step-Up Mode Full Load ● 43 50 59 %
Step-Down Mode
● 24 34 50 %
t
ON
Switch ON Time: Step-Up Mode I
LIM
Tied to V
IN
● 5.0 7 9.0 µs
Step-Down Mode V
OUT
= 5V, V
IN
= 12V ● 3.3 5 7.8 µs
Reference Line Regulation 2V ≤ V
IN
≤ 5V ● 0.2 0.7 %/V
V
SAT
SW Saturation Voltage, Step-Up Mode V
IN
= 3V, I
SW
= 650mA ● 0.5 0.65 V
SW Saturation Voltage, Step-Down Mode V
IN
= 12V, I
SW
= 650mA ● 1.1 1.50 V
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
V
IN
= 3V, 0°C ≤ T
A
≤ 70°C unless otherwise noted.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: This specification guarantees that both the high and low trip points
of the comparator fall within the 1.20V to 1.30V range.
Note 3: The output voltage waveform will exhibit a sawtooth shape due to
the comparator hysteresis. The output voltage on the fixed output versions
will always be within the specified range.
Note 4: 100k resistor connected between a 5V source and the A0 pin.
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.V
IN
= 3V, Military or Commercial Version
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LT1111IS8#TRPBF

Mfr. #:
Buy LT1111IS8#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Micropower DC/DC Converter Adjustable and Fixed 5V, 12V
Lifecycle:
New from this manufacturer.
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